Testing and adjusting apparatus for cord circuits



J. F. TOOME'Y. TESTING AND. ADJUS-TIING'APPARATUS FOR com) CIRCUITS.

APPLICATION FILED MARQQ; $920.

Patented ept. 12, 1922;

2 SHEETS-SHEET 1.

WQWTE m INVENTOR. affijmfiay ATTORNEY J. F. TOOMEY. TESTING -AND ADJUSTING APPARATUS FOR 00m) CIRCUITS.

APPLICATION FILED MAR 9; 1920.

PatentedSept. 12 E226 2 SHEETS-SHEET 2.

AWVENTOR. if? 2295 W Q A TZURNEY' F R mttt Patented Sept, 12, 1922.

entree star-cs aren't oFaFica JOHN F. TOOIVIEY, OF NEW YORK, N. Y., ASSIGNOR T AMERICAN TELEPHONE AND TELEGRAPH COMPANY, A CORPORATION OF .NEW YORK,

rescin AND Anmsrrne APPARATUS non conn orncuirs.

AppIication filed March 9, 1920. Serial 1Y0. 36%,397.

To all whom it may concern:

Be it known that I, J 01 n F. TooMnY, residing at New York, in the county of New York and State of New York, have invented 5 certain Improvements in Testing and Adjusting Apparatus for Cord Circuits, of which the following is a specification. I This invention relates to testing apparatus, and more particularly to equipment or testing and adjusting the various apparatus associated with a telephone cord circuit.

One of the principal. objects of this invention consists in providing testing equipment which, when connected to a cord circuit, affords means to determine whether the supervisory relays associated with the cord circuit "function properly under conditions which are either approximately the same or are more severe than those experienced in actual service.

Another object consists in providing adjusting equipment whereby the adjusting of the supervisory relays to meet the desired operating conditions may be done in an efficient manner.

Other and further objects of the invention will appear from the following description taken in connection with the accompanying drawings, l igures l and 2 of which, when arranged with l ig. 2 to the right 01 ,liig. 1,

embody a circuit diagram of the testingand.

adjustingteatures of the invention.

Fig. '1 illustrates a circuit diagram o l. a standard toll cord circuit terminating in the usual front and back plugs P and'P which are adapted for insertion into the usual line jacks (not shown) that are in' stalled in a switchboard. A, direct current 0 supervisory relay 1. and an alternating cur: rent supervisory relay2 are associated with said cord circuit, whereby the said cord circuit may be used to establish a supervised connection either between two long distance toll lines or between a long distance toll line and a toll switching trunk line or other similar triuilis. If two long distance toll lines are connected by inserting plugs P and P into two line jacks (not shown) in which the said toll lines terminate at a switchboard, the alternating current relay 2 may be energized by alternatingcurrent which may be transmitted over each or eitherot sa d toll lines. The circuit containiii the direct current supervisory relay 1 $111011 is normally bridged across the said cbrd circult, is opened by the Operation of marr inal relay 3 when thecord circuit is used to establish a connection between two 'lon d stance toll lines, whereby. the loss trans mission due to such bridged relay is prevented; If, however, a long distance toll line is connected by said cord circuitto a toll switching line oyer which direct current is transmitted for supervisory purposes, the alternating current relay 2 may be energized by the alternatin ringing cur rent transmitted over the long distance toll line, and the direct current supervisory tolay 1 may be energized by the direct current transmitted over-"the toll switching trunk line. i

In addition to the usual line jacks special acks J and J are multiplied ateach switchboard section in order that the toll cord ,ci1' cuits located in each switchboard section may be connected with the testing 'or adjusting circuit shownin Fig.

Jacks J and J, shown in Fig. 2 and hereinafter designated as control jacks, are connected to jacks J and J and are preferably mounted in the rear of the switchboard sections wherein jacks J P and J" appear. In order that, the testing or adjusting "circuit may be controlled. from the point at which the supervisory relays of the cord circuit to be tested are located. a portable test set T is provided, the plug P of ,which may be inserted in the control jacks J or J and the plug P of which may be inserted into lamp jack .T of the auxiliary circuit which.

is associated withthe cordcircuit. In order to test the supervisoryrelays of the cord, either of the plugs of the toll cord with which said relays are associated may be inserted in either of the acks Jtand J at the switchboard, and plug, P inserted ineither oi. the control jacksJ' and J, respectively,

and the plug 1 inserted in ack J". Then by manipulating the keys of the portable and test set T, the operation of the supervisory relays may be observed and suitable adjustments may be made if said relays are not functioning properly.

The portable test set T comprises keys K K K K*, K and K. Keys K K K and K are preferably of the locking type and the two first mentioned keys are adapted to control the adjustment of the direct current supervisory relays of a cord circuit;

' and apparatus shown in the drawings embodied in Figs. 1 and 2, the invention may now be made clear from the following description of its operation.

V hen it is desired to adjust the apparatus of the cord circuit shown in Fig. 1, the key 6 of Fig. 2 is operated, and completes the following circuit: from ground, lower contact of said key, conductor 7, resistance 8, through armature 9, field winding 10 of motor interrupter M to battery 12. The depression of key 6 also closes the following circuit: from battery 12, conductor 13, lamp 14, upper contact of key 6, conductor 15, spring 16 to ground. The closing of the first-mentioned circuit by the depression of key 6, causes the motor interrupter apparatus M to be set in motion, and the closing of the second mentioned circuit provides for the intermittent lighting of lamp 1a which indicates whether or not the interrupter is working properly, and serves as a guard signal in case said interrupter is left running when the circuit not in use.

Key 17 is now depressed for the purpose of providing a circuit through rheostat 18, whereby the annneter 1.9 may be adjusted to the proper current value of an actual line over the following circuit: from grounded battery 20, resistance 21, conductor 22, resistance 28, conductor 2.4., letthand outer contact of key 17, conductor 25, resistance 26, conductor 27, rheostat 18, conductor 28, outer rightha-nd contact of key 1.7, through ammeter 19 to ground. By now adjusting rheostat 18 the current flow over the above traced circuit, which will be indicated by ammeter 19, may be regulated as desired. The circuit is now in condition for testing the apparatus of: a cord circuit.-

Tes'ting direct current suywwuieory relay.

Assuming that it is desired to make a test to determine whether the direct current supervisocv relay 1. Functions properly, the plug P is inserted in the jack J; plug P of portable test set T is inserted in the control ack J and plug 1 is inserted in ack J. The key K of said test set is now depressed, whereupon the "following circuit is closed: from grounded battery 29 of the cord circuit, winding of relay 30, marginal relay 3 and relay 5, sleeve conductor of said cord, sleeve contacts of plug P and jack J sleeve contacts of jack J and plug P closed tact which will be described later. The oper ation oi' relay 39 will complete an intermittent circuit from ground through spring 16 of motor interruj'iter M, conductor d0, armature and contact of relay 39, conductor 11, winding of relay {L2 to battery. The relay 412 will be operated intermittentlyby this circuit, and. each time it operates will close a circuit from ground through its upper armature and contact over conductor 13, resistance 41:41, upper back contact and armature of relay 45, conductor 46, upper back contact of relay 1?, closed armature and contact of relay 35, through tip contacts o'l jack J and plug 1 closed contact and.

armature o1 relay 5, conductor 4-8, contact of key 19, condrictor 50, through one side of coil. contact of marginal. relay 3, winding of supervisory relay 1, out through the other side of coil I32, conductor 53, lower right hand. contact of? key 19, ring contacts of plug l and jack .l lower contact and armature ol relay 35, condiuctor 60, lower armature and back contact of relay 47, resistance 21 to grminded, battery .30. This circuit will irovide tor the intermittent energizmtion of supervisory relay 1. This circuit is 01 relatively low resistance and the current flow thercover is suliicientto saturate relay 1. The operation of said relav will indicate that it is properly adjusted to meet this condition and that i is armature will not stick up under any of the conditions that it is likely to undergo in service. The relay 1 will attract its armature intermittently, and close the 'l'ollowiiu circuit: from grounded ba tery 53- in the cord circuit, filament of lamp 55;, con act and arn1ature of relay 1, winding of relav 56 to ground. Relay 56 is energized by this circult and. closes a circuit through its contact from battery 58, conductor 59, slccve contacts o1 ack J and plug P. filament of lamp L ring contacts 0 1 plug 1. and jack d to ground. This circuit will cause lamp L to light. Thus each time the sujiicrvisory relay 1 operates and lights the supervisory lamp 55, the indicating lampv L will also be lighted. T he flashing of lamp L at, the proper intervals will indicate that the direct current relay 1 will operate properly under the condition described,

The plug P is left inserted inthe jack J and key'K of the portable test set T may now be depressed to provide for the minimum current condition and v the fast operation of direct supervisory relay 1. lVhen the key K is depressed a current path similar to that outlined in connection with the key K will be provided, but instead of traversing the key K as previously described, it passes through the lower make contact of key K? and causes the apparatus contained in said circuit to function as described above. An additional current path is also provided, which is similar to the previously described path, to the resistance 32, from which it continues as "follows: from conductor 31 of the test set T to the upper contact of key K ring contacts ofplug P and jack J conductor 80, lower armature and contact of relay 87, winding of relay 4:5, to ground. The second mentioneril circuit will cause the relay L5 to operate, and thereby close a circuit from ground through spring 60 of the interrupter M, conductor 61, lower contactand armature ofrelay d5, conductor 62, winding ofrelay 63 to grounded battery. I An intermittent circuit will thus be provided by the interrupter, which opens and closes the armature of relay 63, and said armature upon opening and closing provides an intermittent current path from its upper grounded armature by way of conductor 642,. right hand normal contact of key 17, conductor 28, rheostat 18, conductormay have characteristics similar to those of an actual line.

Tln s it will be apparentfrom the above descriptions that current may be applied intermittently to the direct current relay over a circuit o'l relatively low resistance and the relay saturated in order that tests may be made to insure that the armature off said relay will not stick up. Current may also be intermittently applied to the direct your rent relay over a circuit of relatively higher resistance, such as theresistance of an actual line, and the'rclay n iay thus be tested with an operating current such as would be met visory relay operates satisfactorily under these'two tests, it maybe considered properly adj usted.

Adjustment of alternating current supervisor-y relay.

F or the adjustment of the alternating current supervisory relay 2, plugl may be connected with jack J and plug P associated. with ack The key hi is now operated so as; to restore any of the keys which may have been locked down during the pre-.

vious testing. The depression of key K also closes a circuit from grounded battery 29,

; upper winding oirelay 30, sleeve conductor of the toll cord and sleeve contacts of plug P and ack'J sleeve contacts of jack J and plug P closed contact of key Kflconductor 31, upper contact of key K, conductor 33, tip contacts of plug 1 and jack J winding of relay 6G,; winding oi marginal relay 3'7, conductorSS, winding of relay 39 to groniul.

This circuit willcause relays 30, 66, 37 and 39 to operate. Relayfi? upon operating will close a circuit from ground, over its upper contactand armature, conductor 67, winding of relay d7, to grounded battery; and the closing oil. this circuitwill energize relay 47. The energization oi relay 4e? will close a circuit over its front contacts andfarmatures, over conductors (S Sand 69, resistances 70, 71, 72, S l and including the back contact and armature of relay 75. It will be obvious from the foregoing description that the operation of relay 427 has resulted in the connection of the alternating current erpiipment ol'the adjustingcircuit to the cord circuit instead of the direct current equipment pre viously described.

The key ii. is now depressed and the iollowing high resistance. circuit closed: from battery 29, windin of relay 80, sleeve conductor of toll corn, sleeve contacts of plug 1 and ack J sleeve conductors of jack J 1 123 .1 .at .5; 17, 'VS 1 am p u AL coscr. con ac o. rt it. conductor 31, resistance 32,.lower make contact of key K conductor YS, upper make contact, o t keylii, resistance 79., ring contacts of plug i and jack Qli", conductm. 80, lower armature and front contact er .rnarginal re-'- lay 37, which had been ruperal'ed as plreviously outlined, conductor til, through windingso'l relays 76 and T5, to ground. This circuit does not operate marginal. relay 75, but relay 76 will. operate at this timeaud attract its armatures. The energination oi rela fi'tiwill, also provide a high resistance circuit lTOl ringing current from source. (l,

over conductors 82 and 83, resistances Si, 85,

and 71, conductors G8 and 69, front c011- tacts and armatures of relay d7, conductors 86 and 87, contacts and armatures of relay 66, tip and ring contacts of jack J and plug P through contacts of key d9 of the'toll cord and over conductors 88 to windings of the alternating current supervisory relay 2. The relay 2 should not be operated by this current, since part of the bridged resistance 7 2 in the ringing circuit is short circuited by the contact of relay 75, and relay 2 receives its non-operative current value. Should, however, the lamp L of test set T light at this t'in'ie, such indication will show that the relay 2- did operate, and is therefore not working properly. In that case the key K of the test set should be depressed, and relay 2 should be adjusted, after which the operation previously described may be repeated until said relay functions properly.

The key K should be depressed next and then X should be operated. The depression of key K releases key K which was pre vionsly operated and completes a circuit through the windings of relays 66, 37 an d 39 as formerly outlined, thus connecting alter nating current generator G of the adjusting circuit to the toll cord. The depression of key K will close a circuit from grounded battery 29 in the toll cord, winding of relay 3t), sleeve contacts of pin P and jack J ,,sleeve contacts of jack J and plug P contact or key K lower and upper contacts of key K, lower contact of key K, ring contacts o'l plug 1? and jack J, conductor S0,lower armature and make contact of relay 37 conductor 81, windings of relays 76 and '15 to ground. This circuit is of lower resistance than the previously traced circuit, as the resistances 32 and 79 are not included therein, and will accordingly provide sutlicient current for the energization of relays 7 5 and 7(3. The operation of marginal relay will cause its armature to be attracted, removing the shunt normally closed about the upper part oi bridged impedance 72, thereby increi'ising the impedance bridged across conductors 8 2 and S3. The increased impedance bridged across conductors 82 and 83 will decrease the current drain through the bridged impedance 72, and therefore permit sutlicient cur rent to flow over the previously traced circuit from the generator G to relay 2, and the current now transmitted to said relay 'lrom generator G will be equal to the operating current used under actual conditions and said relay should be energized. ll the relay 2 responds to this current it is properly adjusted, and upon operating will open the following circuit which had previously been closed by the operation of relay 30. From grounded battery 29, contact of relay 80, conductor 93 to Emmet, winding of relay 11, contact of relay 2 to ground. Upon the breaking of this circuit a new circuit is closed on the release of relay 11, from battery 29 contact 30 conductor 98, point 94, through lamp 55 and relay 4 in parallel to the contact and armature of relay 11, over concuctor 96 to contact 92 of key 98, Winding of relay S9, to ground. This circuit energizes relay 4 which locks up and shunts the contact of relay l1 and thus makes the circuit just traced independent of said cont act. The relay 89 will also be energized by this circuit and will close a circuit through its contact from battery, filament of la1np90 to ground, thereby lighting said lamp.- The operation ot relay 89 will also close a circuit :lron'i battery, through its armatin-c and contact, conductor 9i tip conductors of jack J and plug P filament of lamp L ring contacts of said plug and jack to ground and thereby provide for the lighting ol. lamp L of T. Thus the operation of relay 89 will cause the lamps 90 and L to act in unison w each other. The lighting of lamp L of test 'set T under the above described tests will indicate that relay 2 is properly adjusted for actual service conditioi'is. lhe operation of key K at this time will cause the circuits previously traced to resume their normal condition.

It should he understood ti ances used in the interrupter circuit and in the alternating circuit may be of such value or values that the current which flows through the circuit will be either the same as or somewhat less than the minimum, or somewhat greater than the maxinuun cur rent that ltows under actual service conditions.

It will now be clear that by this inven tion a simple, convenient and elliciei'it arrangement of circuits has been devised whcrcl iy any toll cord may be plugged into a convenient adjusting jack and the functioning oi the various apparatus associated with the said cord circuit may be determined by nuinipu lating the keys 2 ociated with. the test set. it any apparatus is tonne detective on such test, the cord witl'i whi h the detective zipparatus is associated may be controlled by the test set from a point adjacent to such a )paratus and thereby the detective apparatus may be adjusted in a convenient and efficient manner.

{l hile the invention has been disclo ed as embodied in certain specific organized-iom: and arrangements, it is to he understood that its embodiment may be varied without departing from the spirit ol. the invention as defined in the following claims.

What is claimed is:

1. A. testing system com in'ising an operai the resisttors cord circuit, electromechanisms included in said circuit operable by current of di i i erent charactcristics, an auxiliary circuit. associated with said clectnmechanisms, a test-- 1 asses? ing circuit adapted to be associated with said cord circuit, a portable test adapted to be associated with said testing circuit and said auxiliary circuit, switching means in said set for controlling the application of current to said electromechanisms, and signaling means in said set operable when associated with said auxiliary circuit for indicating the action of said electromechanisms upon the application of current thereto.

2. A testing system comprising an operators cord circuit having a direct current relay and an alternating current relay, an auxiliary circuit associated with said relays, a. testing circuit adapted. to be associated with said cord circuit, means simulating normal direct and alternating current operating conditions associated with said testing circuit, a portable test set adapted to be associated with said testing circuit and said auxiliary circuit, switching means in said partable testing set for selectively subjecting said relays to normal direct or alternating current operating conditions, and signaling means in said test set operable when associated with said auxiliary circuit for indicating the action of said relays when so subjected.

3. A testing system comprising an operators cord circuit having a direct current relay and an alternating current relay, an auxiliary circuit associated with said relays, a testing circuit adapted to be associated with said cord circuit, means simulating normal direct and alternating current operating conditions associated withv said testing circuit, a portable test set adapted to be associated with said testing circuit and said auxiliary circuit, switching means in said portable test set for selectively subjecting said relays to normal direct or alternating current operating conditions and signaling means in said test set operable when associated with said auxiliary circuit for inclieating the operation of said relays when so subjected.

4. A testing system comprising a cord circuit having a direct current relay and an alternating current relay, an auxiliary circuit associated with said relays, a testing circuit adapted to be associated with the cord circuit, an interrupter in said testing circuit having a member of slow ope 'ating frequency and a member of relatively fast operating frequency, resistance elements simulating normal operating characteristics associated with the fast operating member adapted to be associated with the direct current relay, an artificial line simulating normal operating characteristics adapted to be associated with the alternating current relay, a test set, means for associating the test set with the testing circuit and auxiliary circuit, switching means in said test set for selectively associating the direct current relay and alternating current relay with the direct current and alternating current equipment of the testing circuit, and signaling means in said test set for indicating the operations of said relays when so associated.

5. A testing system comprising a corl circuit having a direct current relay and an alternating current relay, an auxiliary circuit associated with said relays, a testing circuit adapted to be associated with the cord circuit, control jacks associated with the testing circuit, relays associated with the tip conductors of said control jacks for associating said direct current and alternating current relays with the testingcircuit, a marginal relay connected in series with the first mentioned relay, a plurality of re lays associated with said marginal. relay for controlling the connection of the direct current equipment with the direct current relay, a relay controlled by said marginal relay for associating the alternating current equipment with the alternating current relay, a portable test set adapted to be associated with the control jacks of the testing circuit and said auxiliary circuit, switching means in said test set for selectively associating the direct current relay and alternating current relay with the direct current and alternating current equipment in the testing circuit, andsignaling means in said test set for indicating the operation of the direct and alternating current relays.

6. A testing system comprising a cord circuit having a direct current relay and an alternating current relay, an auxiliary circuit associated with said relays, a testing circuit adapted to be associated with the cord circuit control jacks associated with the testing circuit, direct current equipment simulating actual service conditions associated with the testing circuit, an interrupter in said equipment having a member of slow operating frequency associated with a low resistance circuit and a member of relatively fast operating frequency associated with a high resistance circuit, alternating current equipment simultating actual service conditions associated with the testing circuit, a portable test set adapted to be asso ciated with the control jacks of the testing circuit and said auxiliary circuit, switching means in said set, a pair of relays associated with the slow operating member operable by certain of said switching means for sub jecting the direct current relay to a test simulating a low resistance circuit under actual service conditions, a second pair of relays associated with the fast operating member operable by other of said switching means for subjecting the direct current relay to a test simulating a relatively high 'resistance circuit under actual service condi tions, a marginal relay in the testing circuit and. alternating current relnys when so sub- 'jecteil.

In testimony whereof, I have signed my 10 nanne to this specification this 8th day of March, 1920.

JOHN F. TOOMEY. 

